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old-cross-binutils/gas/as.c
Alan Modra 6f2750feaf Copyright update for binutils
2016-01-01 23:00:01 +10:30

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/* as.c - GAS main program.
Copyright (C) 1987-2016 Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
GAS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GAS is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
License for more details.
You should have received a copy of the GNU General Public License
along with GAS; see the file COPYING. If not, write to the Free
Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
02110-1301, USA. */
/* Main program for AS; a 32-bit assembler of GNU.
Understands command arguments.
Has a few routines that don't fit in other modules because they
are shared.
bugs
: initialisers
Since no-one else says they will support them in future: I
don't support them now. */
#define COMMON
#include "as.h"
#include "subsegs.h"
#include "output-file.h"
#include "sb.h"
#include "macro.h"
#include "dwarf2dbg.h"
#include "dw2gencfi.h"
#include "bfdver.h"
#ifdef HAVE_ITBL_CPU
#include "itbl-ops.h"
#else
#define itbl_init()
#endif
#ifdef HAVE_SBRK
#ifdef NEED_DECLARATION_SBRK
extern void *sbrk ();
#endif
#endif
#ifdef USING_CGEN
/* Perform any cgen specific initialisation for gas. */
extern void gas_cgen_begin (void);
#endif
/* We build a list of defsyms as we read the options, and then define
them after we have initialized everything. */
struct defsym_list
{
struct defsym_list *next;
char *name;
valueT value;
};
/* True if a listing is wanted. */
int listing;
/* Type of debugging to generate. */
enum debug_info_type debug_type = DEBUG_UNSPECIFIED;
int use_gnu_debug_info_extensions = 0;
#ifndef MD_DEBUG_FORMAT_SELECTOR
#define MD_DEBUG_FORMAT_SELECTOR NULL
#endif
static enum debug_info_type (*md_debug_format_selector) (int *) = MD_DEBUG_FORMAT_SELECTOR;
/* Maximum level of macro nesting. */
int max_macro_nest = 100;
/* argv[0] */
static char * myname;
/* The default obstack chunk size. If we set this to zero, the
obstack code will use whatever will fit in a 4096 byte block. */
int chunksize = 0;
/* To monitor memory allocation more effectively, make this non-zero.
Then the chunk sizes for gas and bfd will be reduced. */
int debug_memory = 0;
/* Enable verbose mode. */
int verbose = 0;
/* Keep the output file. */
static int keep_it = 0;
segT reg_section;
segT expr_section;
segT text_section;
segT data_section;
segT bss_section;
/* Name of listing file. */
static char *listing_filename = NULL;
static struct defsym_list *defsyms;
#ifdef HAVE_ITBL_CPU
/* Keep a record of the itbl files we read in. */
struct itbl_file_list
{
struct itbl_file_list *next;
char *name;
};
static struct itbl_file_list *itbl_files;
#endif
static long start_time;
#ifdef HAVE_SBRK
char *start_sbrk;
#endif
static int flag_macro_alternate;
#ifdef USE_EMULATIONS
#define EMULATION_ENVIRON "AS_EMULATION"
extern struct emulation mipsbelf, mipslelf, mipself;
extern struct emulation i386coff, i386elf, i386aout;
extern struct emulation crisaout, criself;
static struct emulation *const emulations[] = { EMULATIONS };
static const int n_emulations = sizeof (emulations) / sizeof (emulations[0]);
static void
select_emulation_mode (int argc, char **argv)
{
int i;
char *p, *em = 0;
for (i = 1; i < argc; i++)
if (!strncmp ("--em", argv[i], 4))
break;
if (i == argc)
goto do_default;
p = strchr (argv[i], '=');
if (p)
p++;
else
p = argv[i + 1];
if (!p || !*p)
as_fatal (_("missing emulation mode name"));
em = p;
do_default:
if (em == 0)
em = getenv (EMULATION_ENVIRON);
if (em == 0)
em = DEFAULT_EMULATION;
if (em)
{
for (i = 0; i < n_emulations; i++)
if (!strcmp (emulations[i]->name, em))
break;
if (i == n_emulations)
as_fatal (_("unrecognized emulation name `%s'"), em);
this_emulation = emulations[i];
}
else
this_emulation = emulations[0];
this_emulation->init ();
}
const char *
default_emul_bfd_name (void)
{
abort ();
return NULL;
}
void
common_emul_init (void)
{
this_format = this_emulation->format;
if (this_emulation->leading_underscore == 2)
this_emulation->leading_underscore = this_format->dfl_leading_underscore;
if (this_emulation->default_endian != 2)
target_big_endian = this_emulation->default_endian;
if (this_emulation->fake_label_name == 0)
{
if (this_emulation->leading_underscore)
this_emulation->fake_label_name = "L0\001";
else
/* What other parameters should we test? */
this_emulation->fake_label_name = ".L0\001";
}
}
#endif
void
print_version_id (void)
{
static int printed;
if (printed)
return;
printed = 1;
fprintf (stderr, _("GNU assembler version %s (%s) using BFD version %s\n"),
VERSION, TARGET_ALIAS, BFD_VERSION_STRING);
}
#ifdef DEFAULT_FLAG_COMPRESS_DEBUG
enum compressed_debug_section_type flag_compress_debug
= COMPRESS_DEBUG_GABI_ZLIB;
#endif
static void
show_usage (FILE * stream)
{
fprintf (stream, _("Usage: %s [option...] [asmfile...]\n"), myname);
fprintf (stream, _("\
Options:\n\
-a[sub-option...] turn on listings\n\
Sub-options [default hls]:\n\
c omit false conditionals\n\
d omit debugging directives\n\
g include general info\n\
h include high-level source\n\
l include assembly\n\
m include macro expansions\n\
n omit forms processing\n\
s include symbols\n\
=FILE list to FILE (must be last sub-option)\n"));
fprintf (stream, _("\
--alternate initially turn on alternate macro syntax\n"));
#ifdef DEFAULT_FLAG_COMPRESS_DEBUG
fprintf (stream, _("\
--compress-debug-sections[={none|zlib|zlib-gnu|zlib-gabi}]\n\
compress DWARF debug sections using zlib [default]\n"));
fprintf (stream, _("\
--nocompress-debug-sections\n\
don't compress DWARF debug sections\n"));
#else
fprintf (stream, _("\
--compress-debug-sections[={none|zlib|zlib-gnu|zlib-gabi}]\n\
compress DWARF debug sections using zlib\n"));
fprintf (stream, _("\
--nocompress-debug-sections\n\
don't compress DWARF debug sections [default]\n"));
#endif
fprintf (stream, _("\
-D produce assembler debugging messages\n"));
fprintf (stream, _("\
--debug-prefix-map OLD=NEW\n\
map OLD to NEW in debug information\n"));
fprintf (stream, _("\
--defsym SYM=VAL define symbol SYM to given value\n"));
#ifdef USE_EMULATIONS
{
int i;
char *def_em;
fprintf (stream, "\
--em=[");
for (i = 0; i < n_emulations - 1; i++)
fprintf (stream, "%s | ", emulations[i]->name);
fprintf (stream, "%s]\n", emulations[i]->name);
def_em = getenv (EMULATION_ENVIRON);
if (!def_em)
def_em = DEFAULT_EMULATION;
fprintf (stream, _("\
emulate output (default %s)\n"), def_em);
}
#endif
#if defined OBJ_ELF || defined OBJ_MAYBE_ELF
fprintf (stream, _("\
--execstack require executable stack for this object\n"));
fprintf (stream, _("\
--noexecstack don't require executable stack for this object\n"));
fprintf (stream, _("\
--size-check=[error|warning]\n\
ELF .size directive check (default --size-check=error)\n"));
fprintf (stream, _("\
--sectname-subst enable section name substitution sequences\n"));
#endif
fprintf (stream, _("\
-f skip whitespace and comment preprocessing\n"));
fprintf (stream, _("\
-g --gen-debug generate debugging information\n"));
fprintf (stream, _("\
--gstabs generate STABS debugging information\n"));
fprintf (stream, _("\
--gstabs+ generate STABS debug info with GNU extensions\n"));
fprintf (stream, _("\
--gdwarf-2 generate DWARF2 debugging information\n"));
fprintf (stream, _("\
--gdwarf-sections generate per-function section names for DWARF line information\n"));
fprintf (stream, _("\
--hash-size=<value> set the hash table size close to <value>\n"));
fprintf (stream, _("\
--help show this message and exit\n"));
fprintf (stream, _("\
--target-help show target specific options\n"));
fprintf (stream, _("\
-I DIR add DIR to search list for .include directives\n"));
fprintf (stream, _("\
-J don't warn about signed overflow\n"));
fprintf (stream, _("\
-K warn when differences altered for long displacements\n"));
fprintf (stream, _("\
-L,--keep-locals keep local symbols (e.g. starting with `L')\n"));
fprintf (stream, _("\
-M,--mri assemble in MRI compatibility mode\n"));
fprintf (stream, _("\
--MD FILE write dependency information in FILE (default none)\n"));
fprintf (stream, _("\
-nocpp ignored\n"));
fprintf (stream, _("\
-o OBJFILE name the object-file output OBJFILE (default a.out)\n"));
fprintf (stream, _("\
-R fold data section into text section\n"));
fprintf (stream, _("\
--reduce-memory-overheads \n\
prefer smaller memory use at the cost of longer\n\
assembly times\n"));
fprintf (stream, _("\
--statistics print various measured statistics from execution\n"));
fprintf (stream, _("\
--strip-local-absolute strip local absolute symbols\n"));
fprintf (stream, _("\
--traditional-format Use same format as native assembler when possible\n"));
fprintf (stream, _("\
--version print assembler version number and exit\n"));
fprintf (stream, _("\
-W --no-warn suppress warnings\n"));
fprintf (stream, _("\
--warn don't suppress warnings\n"));
fprintf (stream, _("\
--fatal-warnings treat warnings as errors\n"));
#ifdef HAVE_ITBL_CPU
fprintf (stream, _("\
--itbl INSTTBL extend instruction set to include instructions\n\
matching the specifications defined in file INSTTBL\n"));
#endif
fprintf (stream, _("\
-w ignored\n"));
fprintf (stream, _("\
-X ignored\n"));
fprintf (stream, _("\
-Z generate object file even after errors\n"));
fprintf (stream, _("\
--listing-lhs-width set the width in words of the output data column of\n\
the listing\n"));
fprintf (stream, _("\
--listing-lhs-width2 set the width in words of the continuation lines\n\
of the output data column; ignored if smaller than\n\
the width of the first line\n"));
fprintf (stream, _("\
--listing-rhs-width set the max width in characters of the lines from\n\
the source file\n"));
fprintf (stream, _("\
--listing-cont-lines set the maximum number of continuation lines used\n\
for the output data column of the listing\n"));
fprintf (stream, _("\
@FILE read options from FILE\n"));
md_show_usage (stream);
fputc ('\n', stream);
if (REPORT_BUGS_TO[0] && stream == stdout)
fprintf (stream, _("Report bugs to %s\n"), REPORT_BUGS_TO);
}
/* Since it is easy to do here we interpret the special arg "-"
to mean "use stdin" and we set that argv[] pointing to "".
After we have munged argv[], the only things left are source file
name(s) and ""(s) denoting stdin. These file names are used
(perhaps more than once) later.
check for new machine-dep cmdline options in
md_parse_option definitions in config/tc-*.c. */
static void
parse_args (int * pargc, char *** pargv)
{
int old_argc;
int new_argc;
char ** old_argv;
char ** new_argv;
/* Starting the short option string with '-' is for programs that
expect options and other ARGV-elements in any order and that care about
the ordering of the two. We describe each non-option ARGV-element
as if it were the argument of an option with character code 1. */
char *shortopts;
extern const char *md_shortopts;
static const char std_shortopts[] =
{
'-', 'J',
#ifndef WORKING_DOT_WORD
/* -K is not meaningful if .word is not being hacked. */
'K',
#endif
'L', 'M', 'R', 'W', 'Z', 'a', ':', ':', 'D', 'f', 'g', ':',':', 'I', ':', 'o', ':',
#ifndef VMS
/* -v takes an argument on VMS, so we don't make it a generic
option. */
'v',
#endif
'w', 'X',
#ifdef HAVE_ITBL_CPU
/* New option for extending instruction set (see also --itbl below). */
't', ':',
#endif
'\0'
};
struct option *longopts;
extern struct option md_longopts[];
extern size_t md_longopts_size;
/* Codes used for the long options with no short synonyms. */
enum option_values
{
OPTION_HELP = OPTION_STD_BASE,
OPTION_NOCPP,
OPTION_STATISTICS,
OPTION_VERSION,
OPTION_DUMPCONFIG,
OPTION_VERBOSE,
OPTION_EMULATION,
OPTION_DEBUG_PREFIX_MAP,
OPTION_DEFSYM,
OPTION_LISTING_LHS_WIDTH,
OPTION_LISTING_LHS_WIDTH2,
OPTION_LISTING_RHS_WIDTH,
OPTION_LISTING_CONT_LINES,
OPTION_DEPFILE,
OPTION_GSTABS,
OPTION_GSTABS_PLUS,
OPTION_GDWARF2,
OPTION_GDWARF_SECTIONS,
OPTION_STRIP_LOCAL_ABSOLUTE,
OPTION_TRADITIONAL_FORMAT,
OPTION_WARN,
OPTION_TARGET_HELP,
OPTION_EXECSTACK,
OPTION_NOEXECSTACK,
OPTION_SIZE_CHECK,
OPTION_SECTNAME_SUBST,
OPTION_ALTERNATE,
OPTION_AL,
OPTION_HASH_TABLE_SIZE,
OPTION_REDUCE_MEMORY_OVERHEADS,
OPTION_WARN_FATAL,
OPTION_COMPRESS_DEBUG,
OPTION_NOCOMPRESS_DEBUG
/* When you add options here, check that they do
not collide with OPTION_MD_BASE. See as.h. */
};
static const struct option std_longopts[] =
{
/* Note: commas are placed at the start of the line rather than
the end of the preceding line so that it is simpler to
selectively add and remove lines from this list. */
{"alternate", no_argument, NULL, OPTION_ALTERNATE}
/* The entry for "a" is here to prevent getopt_long_only() from
considering that -a is an abbreviation for --alternate. This is
necessary because -a=<FILE> is a valid switch but getopt would
normally reject it since --alternate does not take an argument. */
,{"a", optional_argument, NULL, 'a'}
/* Handle -al=<FILE>. */
,{"al", optional_argument, NULL, OPTION_AL}
,{"compress-debug-sections", optional_argument, NULL, OPTION_COMPRESS_DEBUG}
,{"nocompress-debug-sections", no_argument, NULL, OPTION_NOCOMPRESS_DEBUG}
,{"debug-prefix-map", required_argument, NULL, OPTION_DEBUG_PREFIX_MAP}
,{"defsym", required_argument, NULL, OPTION_DEFSYM}
,{"dump-config", no_argument, NULL, OPTION_DUMPCONFIG}
,{"emulation", required_argument, NULL, OPTION_EMULATION}
#if defined OBJ_ELF || defined OBJ_MAYBE_ELF
,{"execstack", no_argument, NULL, OPTION_EXECSTACK}
,{"noexecstack", no_argument, NULL, OPTION_NOEXECSTACK}
,{"size-check", required_argument, NULL, OPTION_SIZE_CHECK}
,{"sectname-subst", no_argument, NULL, OPTION_SECTNAME_SUBST}
#endif
,{"fatal-warnings", no_argument, NULL, OPTION_WARN_FATAL}
,{"gdwarf-2", no_argument, NULL, OPTION_GDWARF2}
/* GCC uses --gdwarf-2 but GAS uses to use --gdwarf2,
so we keep it here for backwards compatibility. */
,{"gdwarf2", no_argument, NULL, OPTION_GDWARF2}
,{"gdwarf-sections", no_argument, NULL, OPTION_GDWARF_SECTIONS}
,{"gen-debug", no_argument, NULL, 'g'}
,{"gstabs", no_argument, NULL, OPTION_GSTABS}
,{"gstabs+", no_argument, NULL, OPTION_GSTABS_PLUS}
,{"hash-size", required_argument, NULL, OPTION_HASH_TABLE_SIZE}
,{"help", no_argument, NULL, OPTION_HELP}
#ifdef HAVE_ITBL_CPU
/* New option for extending instruction set (see also -t above).
The "-t file" or "--itbl file" option extends the basic set of
valid instructions by reading "file", a text file containing a
list of instruction formats. The additional opcodes and their
formats are added to the built-in set of instructions, and
mnemonics for new registers may also be defined. */
,{"itbl", required_argument, NULL, 't'}
#endif
/* getopt allows abbreviations, so we do this to stop it from
treating -k as an abbreviation for --keep-locals. Some
ports use -k to enable PIC assembly. */
,{"keep-locals", no_argument, NULL, 'L'}
,{"keep-locals", no_argument, NULL, 'L'}
,{"listing-lhs-width", required_argument, NULL, OPTION_LISTING_LHS_WIDTH}
,{"listing-lhs-width2", required_argument, NULL, OPTION_LISTING_LHS_WIDTH2}
,{"listing-rhs-width", required_argument, NULL, OPTION_LISTING_RHS_WIDTH}
,{"listing-cont-lines", required_argument, NULL, OPTION_LISTING_CONT_LINES}
,{"MD", required_argument, NULL, OPTION_DEPFILE}
,{"mri", no_argument, NULL, 'M'}
,{"nocpp", no_argument, NULL, OPTION_NOCPP}
,{"no-warn", no_argument, NULL, 'W'}
,{"reduce-memory-overheads", no_argument, NULL, OPTION_REDUCE_MEMORY_OVERHEADS}
,{"statistics", no_argument, NULL, OPTION_STATISTICS}
,{"strip-local-absolute", no_argument, NULL, OPTION_STRIP_LOCAL_ABSOLUTE}
,{"version", no_argument, NULL, OPTION_VERSION}
,{"verbose", no_argument, NULL, OPTION_VERBOSE}
,{"target-help", no_argument, NULL, OPTION_TARGET_HELP}
,{"traditional-format", no_argument, NULL, OPTION_TRADITIONAL_FORMAT}
,{"warn", no_argument, NULL, OPTION_WARN}
};
/* Construct the option lists from the standard list and the target
dependent list. Include space for an extra NULL option and
always NULL terminate. */
shortopts = concat (std_shortopts, md_shortopts, (char *) NULL);
longopts = (struct option *) xmalloc (sizeof (std_longopts)
+ md_longopts_size + sizeof (struct option));
memcpy (longopts, std_longopts, sizeof (std_longopts));
memcpy (((char *) longopts) + sizeof (std_longopts), md_longopts, md_longopts_size);
memset (((char *) longopts) + sizeof (std_longopts) + md_longopts_size,
0, sizeof (struct option));
/* Make a local copy of the old argv. */
old_argc = *pargc;
old_argv = *pargv;
/* Initialize a new argv that contains no options. */
new_argv = (char **) xmalloc (sizeof (char *) * (old_argc + 1));
new_argv[0] = old_argv[0];
new_argc = 1;
new_argv[new_argc] = NULL;
while (1)
{
/* getopt_long_only is like getopt_long, but '-' as well as '--' can
indicate a long option. */
int longind;
int optc = getopt_long_only (old_argc, old_argv, shortopts, longopts,
&longind);
if (optc == -1)
break;
switch (optc)
{
default:
/* md_parse_option should return 1 if it recognizes optc,
0 if not. */
if (md_parse_option (optc, optarg) != 0)
break;
/* `-v' isn't included in the general short_opts list, so check for
it explicitly here before deciding we've gotten a bad argument. */
if (optc == 'v')
{
#ifdef VMS
/* Telling getopt to treat -v's value as optional can result
in it picking up a following filename argument here. The
VMS code in md_parse_option can return 0 in that case,
but it has no way of pushing the filename argument back. */
if (optarg && *optarg)
new_argv[new_argc++] = optarg, new_argv[new_argc] = NULL;
else
#else
case 'v':
#endif
case OPTION_VERBOSE:
print_version_id ();
verbose = 1;
break;
}
else
as_bad (_("unrecognized option -%c%s"), optc, optarg ? optarg : "");
/* Fall through. */
case '?':
exit (EXIT_FAILURE);
case 1: /* File name. */
if (!strcmp (optarg, "-"))
optarg = "";
new_argv[new_argc++] = optarg;
new_argv[new_argc] = NULL;
break;
case OPTION_TARGET_HELP:
md_show_usage (stdout);
exit (EXIT_SUCCESS);
case OPTION_HELP:
show_usage (stdout);
exit (EXIT_SUCCESS);
case OPTION_NOCPP:
break;
case OPTION_STATISTICS:
flag_print_statistics = 1;
break;
case OPTION_STRIP_LOCAL_ABSOLUTE:
flag_strip_local_absolute = 1;
break;
case OPTION_TRADITIONAL_FORMAT:
flag_traditional_format = 1;
break;
case OPTION_VERSION:
/* This output is intended to follow the GNU standards document. */
printf (_("GNU assembler %s\n"), BFD_VERSION_STRING);
printf (_("Copyright (C) 2016 Free Software Foundation, Inc.\n"));
printf (_("\
This program is free software; you may redistribute it under the terms of\n\
the GNU General Public License version 3 or later.\n\
This program has absolutely no warranty.\n"));
printf (_("This assembler was configured for a target of `%s'.\n"),
TARGET_ALIAS);
exit (EXIT_SUCCESS);
case OPTION_EMULATION:
#ifdef USE_EMULATIONS
if (strcmp (optarg, this_emulation->name))
as_fatal (_("multiple emulation names specified"));
#else
as_fatal (_("emulations not handled in this configuration"));
#endif
break;
case OPTION_DUMPCONFIG:
fprintf (stderr, _("alias = %s\n"), TARGET_ALIAS);
fprintf (stderr, _("canonical = %s\n"), TARGET_CANONICAL);
fprintf (stderr, _("cpu-type = %s\n"), TARGET_CPU);
#ifdef TARGET_OBJ_FORMAT
fprintf (stderr, _("format = %s\n"), TARGET_OBJ_FORMAT);
#endif
#ifdef TARGET_FORMAT
fprintf (stderr, _("bfd-target = %s\n"), TARGET_FORMAT);
#endif
exit (EXIT_SUCCESS);
case OPTION_COMPRESS_DEBUG:
if (optarg)
{
#if defined OBJ_ELF || defined OBJ_MAYBE_ELF
if (strcasecmp (optarg, "none") == 0)
flag_compress_debug = COMPRESS_DEBUG_NONE;
else if (strcasecmp (optarg, "zlib") == 0)
flag_compress_debug = COMPRESS_DEBUG_GABI_ZLIB;
else if (strcasecmp (optarg, "zlib-gnu") == 0)
flag_compress_debug = COMPRESS_DEBUG_GNU_ZLIB;
else if (strcasecmp (optarg, "zlib-gabi") == 0)
flag_compress_debug = COMPRESS_DEBUG_GABI_ZLIB;
else
as_fatal (_("Invalid --compress-debug-sections option: `%s'"),
optarg);
#else
as_fatal (_("--compress-debug-sections=%s is unsupported"),
optarg);
#endif
}
else
flag_compress_debug = COMPRESS_DEBUG_GABI_ZLIB;
break;
case OPTION_NOCOMPRESS_DEBUG:
flag_compress_debug = COMPRESS_DEBUG_NONE;
break;
case OPTION_DEBUG_PREFIX_MAP:
add_debug_prefix_map (optarg);
break;
case OPTION_DEFSYM:
{
char *s;
valueT i;
struct defsym_list *n;
for (s = optarg; *s != '\0' && *s != '='; s++)
;
if (*s == '\0')
as_fatal (_("bad defsym; format is --defsym name=value"));
*s++ = '\0';
i = bfd_scan_vma (s, (const char **) NULL, 0);
n = (struct defsym_list *) xmalloc (sizeof *n);
n->next = defsyms;
n->name = optarg;
n->value = i;
defsyms = n;
}
break;
#ifdef HAVE_ITBL_CPU
case 't':
{
/* optarg is the name of the file containing the instruction
formats, opcodes, register names, etc. */
struct itbl_file_list *n;
if (optarg == NULL)
{
as_warn (_("no file name following -t option"));
break;
}
n = xmalloc (sizeof * n);
n->next = itbl_files;
n->name = optarg;
itbl_files = n;
/* Parse the file and add the new instructions to our internal
table. If multiple instruction tables are specified, the
information from this table gets appended onto the existing
internal table. */
itbl_files->name = xstrdup (optarg);
if (itbl_parse (itbl_files->name) != 0)
as_fatal (_("failed to read instruction table %s\n"),
itbl_files->name);
}
break;
#endif
case OPTION_DEPFILE:
start_dependencies (optarg);
break;
case 'g':
/* Some backends, eg Alpha and Mips, use the -g switch for their
own purposes. So we check here for an explicit -g and allow
the backend to decide if it wants to process it. */
if ( old_argv[optind - 1][1] == 'g'
&& md_parse_option (optc, optarg))
continue;
if (md_debug_format_selector)
debug_type = md_debug_format_selector (& use_gnu_debug_info_extensions);
else if (IS_ELF)
debug_type = DEBUG_DWARF2;
else
debug_type = DEBUG_STABS;
break;
case OPTION_GSTABS_PLUS:
use_gnu_debug_info_extensions = 1;
/* Fall through. */
case OPTION_GSTABS:
debug_type = DEBUG_STABS;
break;
case OPTION_GDWARF2:
debug_type = DEBUG_DWARF2;
break;
case OPTION_GDWARF_SECTIONS:
flag_dwarf_sections = TRUE;
break;
case 'J':
flag_signed_overflow_ok = 1;
break;
#ifndef WORKING_DOT_WORD
case 'K':
flag_warn_displacement = 1;
break;
#endif
case 'L':
flag_keep_locals = 1;
break;
case OPTION_LISTING_LHS_WIDTH:
listing_lhs_width = atoi (optarg);
if (listing_lhs_width_second < listing_lhs_width)
listing_lhs_width_second = listing_lhs_width;
break;
case OPTION_LISTING_LHS_WIDTH2:
{
int tmp = atoi (optarg);
if (tmp > listing_lhs_width)
listing_lhs_width_second = tmp;
}
break;
case OPTION_LISTING_RHS_WIDTH:
listing_rhs_width = atoi (optarg);
break;
case OPTION_LISTING_CONT_LINES:
listing_lhs_cont_lines = atoi (optarg);
break;
case 'M':
flag_mri = 1;
#ifdef TC_M68K
flag_m68k_mri = 1;
#endif
break;
case 'R':
flag_readonly_data_in_text = 1;
break;
case 'W':
flag_no_warnings = 1;
break;
case OPTION_WARN:
flag_no_warnings = 0;
flag_fatal_warnings = 0;
break;
case OPTION_WARN_FATAL:
flag_no_warnings = 0;
flag_fatal_warnings = 1;
break;
#if defined OBJ_ELF || defined OBJ_MAYBE_ELF
case OPTION_EXECSTACK:
flag_execstack = 1;
flag_noexecstack = 0;
break;
case OPTION_NOEXECSTACK:
flag_noexecstack = 1;
flag_execstack = 0;
break;
case OPTION_SIZE_CHECK:
if (strcasecmp (optarg, "error") == 0)
flag_size_check = size_check_error;
else if (strcasecmp (optarg, "warning") == 0)
flag_size_check = size_check_warning;
else
as_fatal (_("Invalid --size-check= option: `%s'"), optarg);
break;
case OPTION_SECTNAME_SUBST:
flag_sectname_subst = 1;
break;
#endif
case 'Z':
flag_always_generate_output = 1;
break;
case OPTION_AL:
listing |= LISTING_LISTING;
if (optarg)
listing_filename = xstrdup (optarg);
break;
case OPTION_ALTERNATE:
optarg = old_argv [optind - 1];
while (* optarg == '-')
optarg ++;
if (strcmp (optarg, "alternate") == 0)
{
flag_macro_alternate = 1;
break;
}
optarg ++;
/* Fall through. */
case 'a':
if (optarg)
{
if (optarg != old_argv[optind] && optarg[-1] == '=')
--optarg;
if (md_parse_option (optc, optarg) != 0)
break;
while (*optarg)
{
switch (*optarg)
{
case 'c':
listing |= LISTING_NOCOND;
break;
case 'd':
listing |= LISTING_NODEBUG;
break;
case 'g':
listing |= LISTING_GENERAL;
break;
case 'h':
listing |= LISTING_HLL;
break;
case 'l':
listing |= LISTING_LISTING;
break;
case 'm':
listing |= LISTING_MACEXP;
break;
case 'n':
listing |= LISTING_NOFORM;
break;
case 's':
listing |= LISTING_SYMBOLS;
break;
case '=':
listing_filename = xstrdup (optarg + 1);
optarg += strlen (listing_filename);
break;
default:
as_fatal (_("invalid listing option `%c'"), *optarg);
break;
}
optarg++;
}
}
if (!listing)
listing = LISTING_DEFAULT;
break;
case 'D':
/* DEBUG is implemented: it debugs different
things from other people's assemblers. */
flag_debug = 1;
break;
case 'f':
flag_no_comments = 1;
break;
case 'I':
{ /* Include file directory. */
char *temp = xstrdup (optarg);
add_include_dir (temp);
break;
}
case 'o':
out_file_name = xstrdup (optarg);
break;
case 'w':
break;
case 'X':
/* -X means treat warnings as errors. */
break;
case OPTION_REDUCE_MEMORY_OVERHEADS:
/* The only change we make at the moment is to reduce
the size of the hash tables that we use. */
set_gas_hash_table_size (4051);
break;
case OPTION_HASH_TABLE_SIZE:
{
unsigned long new_size;
new_size = strtoul (optarg, NULL, 0);
if (new_size)
set_gas_hash_table_size (new_size);
else
as_fatal (_("--hash-size needs a numeric argument"));
break;
}
}
}
free (shortopts);
free (longopts);
*pargc = new_argc;
*pargv = new_argv;
#ifdef md_after_parse_args
md_after_parse_args ();
#endif
}
static void
dump_statistics (void)
{
#ifdef HAVE_SBRK
char *lim = (char *) sbrk (0);
#endif
long run_time = get_run_time () - start_time;
fprintf (stderr, _("%s: total time in assembly: %ld.%06ld\n"),
myname, run_time / 1000000, run_time % 1000000);
#ifdef HAVE_SBRK
fprintf (stderr, _("%s: data size %ld\n"),
myname, (long) (lim - start_sbrk));
#endif
subsegs_print_statistics (stderr);
write_print_statistics (stderr);
symbol_print_statistics (stderr);
read_print_statistics (stderr);
#ifdef tc_print_statistics
tc_print_statistics (stderr);
#endif
#ifdef obj_print_statistics
obj_print_statistics (stderr);
#endif
}
static void
close_output_file (void)
{
output_file_close (out_file_name);
if (!keep_it)
unlink_if_ordinary (out_file_name);
}
/* The interface between the macro code and gas expression handling. */
static size_t
macro_expr (const char *emsg, size_t idx, sb *in, offsetT *val)
{
char *hold;
expressionS ex;
sb_terminate (in);
hold = input_line_pointer;
input_line_pointer = in->ptr + idx;
expression_and_evaluate (&ex);
idx = input_line_pointer - in->ptr;
input_line_pointer = hold;
if (ex.X_op != O_constant)
as_bad ("%s", emsg);
*val = ex.X_add_number;
return idx;
}
/* Here to attempt 1 pass over each input file.
We scan argv[*] looking for filenames or exactly "" which is
shorthand for stdin. Any argv that is NULL is not a file-name.
We set need_pass_2 TRUE if, after this, we still have unresolved
expressions of the form (unknown value)+-(unknown value).
Note the un*x semantics: there is only 1 logical input file, but it
may be a catenation of many 'physical' input files. */
static void
perform_an_assembly_pass (int argc, char ** argv)
{
int saw_a_file = 0;
#ifndef OBJ_MACH_O
flagword applicable;
#endif
need_pass_2 = 0;
#ifndef OBJ_MACH_O
/* Create the standard sections, and those the assembler uses
internally. */
text_section = subseg_new (TEXT_SECTION_NAME, 0);
data_section = subseg_new (DATA_SECTION_NAME, 0);
bss_section = subseg_new (BSS_SECTION_NAME, 0);
/* @@ FIXME -- we're setting the RELOC flag so that sections are assumed
to have relocs, otherwise we don't find out in time. */
applicable = bfd_applicable_section_flags (stdoutput);
bfd_set_section_flags (stdoutput, text_section,
applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
| SEC_CODE | SEC_READONLY));
bfd_set_section_flags (stdoutput, data_section,
applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
| SEC_DATA));
bfd_set_section_flags (stdoutput, bss_section, applicable & SEC_ALLOC);
seg_info (bss_section)->bss = 1;
#endif
subseg_new (BFD_ABS_SECTION_NAME, 0);
subseg_new (BFD_UND_SECTION_NAME, 0);
reg_section = subseg_new ("*GAS `reg' section*", 0);
expr_section = subseg_new ("*GAS `expr' section*", 0);
#ifndef OBJ_MACH_O
subseg_set (text_section, 0);
#endif
/* This may add symbol table entries, which requires having an open BFD,
and sections already created. */
md_begin ();
#ifdef USING_CGEN
gas_cgen_begin ();
#endif
#ifdef obj_begin
obj_begin ();
#endif
/* Skip argv[0]. */
argv++;
argc--;
while (argc--)
{
if (*argv)
{ /* Is it a file-name argument? */
PROGRESS (1);
saw_a_file++;
/* argv->"" if stdin desired, else->filename. */
read_a_source_file (*argv);
}
argv++; /* Completed that argv. */
}
if (!saw_a_file)
read_a_source_file ("");
}
int
main (int argc, char ** argv)
{
char ** argv_orig = argv;
int macro_strip_at;
start_time = get_run_time ();
#ifdef HAVE_SBRK
start_sbrk = (char *) sbrk (0);
#endif
#if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
setlocale (LC_MESSAGES, "");
#endif
#if defined (HAVE_SETLOCALE)
setlocale (LC_CTYPE, "");
#endif
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
if (debug_memory)
chunksize = 64;
#ifdef HOST_SPECIAL_INIT
HOST_SPECIAL_INIT (argc, argv);
#endif
myname = argv[0];
xmalloc_set_program_name (myname);
expandargv (&argc, &argv);
START_PROGRESS (myname, 0);
#ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME
#define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out"
#endif
out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME;
hex_init ();
bfd_init ();
bfd_set_error_program_name (myname);
#ifdef USE_EMULATIONS
select_emulation_mode (argc, argv);
#endif
PROGRESS (1);
/* Call parse_args before any of the init/begin functions
so that switches like --hash-size can be honored. */
parse_args (&argc, &argv);
symbol_begin ();
frag_init ();
subsegs_begin ();
read_begin ();
input_scrub_begin ();
expr_begin ();
/* It has to be called after dump_statistics (). */
xatexit (close_output_file);
if (flag_print_statistics)
xatexit (dump_statistics);
macro_strip_at = 0;
#ifdef TC_I960
macro_strip_at = flag_mri;
#endif
macro_init (flag_macro_alternate, flag_mri, macro_strip_at, macro_expr);
PROGRESS (1);
output_file_create (out_file_name);
gas_assert (stdoutput != 0);
dot_symbol_init ();
#ifdef tc_init_after_args
tc_init_after_args ();
#endif
itbl_init ();
dwarf2_init ();
local_symbol_make (".gasversion.", absolute_section,
BFD_VERSION / 10000UL, &predefined_address_frag);
/* Now that we have fully initialized, and have created the output
file, define any symbols requested by --defsym command line
arguments. */
while (defsyms != NULL)
{
symbolS *sym;
struct defsym_list *next;
sym = symbol_new (defsyms->name, absolute_section, defsyms->value,
&zero_address_frag);
/* Make symbols defined on the command line volatile, so that they
can be redefined inside a source file. This makes this assembler's
behaviour compatible with earlier versions, but it may not be
completely intuitive. */
S_SET_VOLATILE (sym);
symbol_table_insert (sym);
next = defsyms->next;
free (defsyms);
defsyms = next;
}
PROGRESS (1);
/* Assemble it. */
perform_an_assembly_pass (argc, argv);
cond_finish_check (-1);
#ifdef md_end
md_end ();
#endif
#if defined OBJ_ELF || defined OBJ_MAYBE_ELF
if ((flag_execstack || flag_noexecstack)
&& OUTPUT_FLAVOR == bfd_target_elf_flavour)
{
segT gnustack;
gnustack = subseg_new (".note.GNU-stack", 0);
bfd_set_section_flags (stdoutput, gnustack,
SEC_READONLY | (flag_execstack ? SEC_CODE : 0));
}
#endif
/* If we've been collecting dwarf2 .debug_line info, either for
assembly debugging or on behalf of the compiler, emit it now. */
dwarf2_finish ();
/* If we constructed dwarf2 .eh_frame info, either via .cfi
directives from the user or by the backend, emit it now. */
cfi_finish ();
keep_it = 0;
if (seen_at_least_1_file ())
{
int n_warns, n_errs;
char warn_msg[50];
char err_msg[50];
write_object_file ();
n_warns = had_warnings ();
n_errs = had_errors ();
if (n_warns == 1)
sprintf (warn_msg, _("%d warning"), n_warns);
else
sprintf (warn_msg, _("%d warnings"), n_warns);
if (n_errs == 1)
sprintf (err_msg, _("%d error"), n_errs);
else
sprintf (err_msg, _("%d errors"), n_errs);
if (flag_fatal_warnings && n_warns != 0)
{
if (n_errs == 0)
as_bad (_("%s, treating warnings as errors"), warn_msg);
n_errs += n_warns;
}
if (n_errs == 0)
keep_it = 1;
else if (flag_always_generate_output)
{
/* The -Z flag indicates that an object file should be generated,
regardless of warnings and errors. */
keep_it = 1;
fprintf (stderr, _("%s, %s, generating bad object file\n"),
err_msg, warn_msg);
}
}
fflush (stderr);
#ifndef NO_LISTING
listing_print (listing_filename, argv_orig);
#endif
input_scrub_end ();
END_PROGRESS (myname);
/* Use xexit instead of return, because under VMS environments they
may not place the same interpretation on the value given. */
if (had_errors () != 0)
xexit (EXIT_FAILURE);
/* Only generate dependency file if assembler was successful. */
print_dependencies ();
xexit (EXIT_SUCCESS);
}
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